With races held across four different circuit classifications, IndyCar is one of the most diverse of motorsport series. Mobil 1 The Grid spoke with drivers in the current 2016 IndyCar series to discover the challenges of racing a combination of Super Speedways, Short Ovals, Road Courses and temporary Street Circuits. Helio Castroneves, Marco Andretti, Spencer Pigot,Graham Rahal, Will Power and Tony Kanaan all feature.